Long COVID
Mild → relapsed
Long COVID exercise-triggered rapid heartbeat, now relapsed; loratadine and lenses helped
- Condition
- Long COVID
- At worst
- Mild (working or studying, with limits)
- Ill before improving or writing
- Not stated
- Last post
- Jul 2026
In their words
- Condition: Long COVID
But after LC, the night after I've done HIIT or brisk walking I had rapid heartbeat like 2-3 hours.
In context ↗ - At worst: Mild
after LC, the night after I've done HIIT or brisk walking I had rapid heartbeat like 2-3 hours
In context ↗ - Now: Relapsed
I think I got remission for 3 years and it comeback again recently
In context ↗ - Began after: COVID
But after LC, the night after I've done HIIT or brisk walking I had rapid heartbeat like 2-3 hours.
In context ↗
Read from 7 of their posts and comments; links to the 7 this page draws on
Summary
A Reddit user with long COVID could walk 30 minutes and do HIIT daily before the illness; afterwards the same exercise brought two to three hours of rapid heartbeat. Loratadine cleared a painful sensitivity and lower-water contact lenses eased dry eyes. Joint pain and allergy symptoms persisted and in June 2026 they reported a relapse. A three-day water fast left almost no symptoms but a racing heart; a 1.5-day dry fast felt bad.
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What they tried
Also tried
antihistamine loratadine· Helped3 days water fasting· HelpedHIIT and brisk walking· Worse1.5 days dry fasting· Worse
Their words about each treatment
- HIIT and brisk walking · Worse
after LC, the night after I've done HIIT or brisk walking I had rapid heartbeat like 2-3 hours
In context ↗ - antihistamine loratadine · Helped
I took antihistamine loratadine every few days because I also got allergy symptom and that sensation/sensitivity gone.
In context ↗ - 3 days water fasting · Helped
I feel really good during 3 days water fasting almost no symptom, usually my symptoms are joint pain and allergy.
In context ↗ - 1.5 days dry fasting · Worse
Dry fasting though, I feel so bad during it.
In context ↗
Their path
How ill they were on the ME/CFS severity scale, estimated from what they describe at each point, in the order they describe; they don’t give enough times to place each step. Hover or tap a point. Dates are when they posted. What the levels mean.
Show as a table
| When | What happened | Where they were | After |
|---|---|---|---|
| onset | long COVID onset; exercise now brings hours of rapid heartbeatBut after LC, the night after I've done HIIT or brisk walking I had rapid heartbeat like 2-3 hours.In context ↗ | Mild | |
| 2026-02-20 | painful skin-touch sensitivity cleared with loratadineI took antihistamine loratadine every few days because I also got allergy symptom and that sensation/sensitivity gone.In context ↗ | Mild | Loratadine (Claritin) |
| 2026-06-06 | symptoms relapsedIt seems I got relapse😭In context ↗ | Mild | |
| 2026-07-25 | almost symptom-free during a 3-day water fast, but heart raced at the end; dry fast felt badI feel really good during 3 days water fasting almost no symptom ... But my heart beat so fast at the end so a bit affraid to redo it.In context ↗ | Mild |
Adverse events
- “But after LC, the night after I've done HIIT or brisk walking I had rapid heartbeat like 2-3 hours.” In context ↗ Heart rhythm problems
- “I used to look for higher water content, didnt realize it actually make my eyes dryer.” In context ↗ Made symptoms worse
- Extended water fasting (3+ days)“But my heart beat so fast at the end so a bit affraid to redo it.” In context ↗ Heart rhythm problems
- Dry fasting“Dry fasting though, I feel so bad during it.” In context ↗ Made symptoms worse
Symptoms mentioned
Heart symptoms & palpitationsMast cell (MCAS) & allergiesNeuropathy & tinglingPain & fibromyalgiaVision problems
Their words about their symptoms
- Heart symptoms & palpitations
the night after I've done HIIT or brisk walking I had rapid heartbeat like 2-3 hours
In context ↗ - Mast cell (MCAS) & allergies
usually my symptoms are joint pain and allergy
In context ↗ - Neuropathy & tingling
I experienced that too. ... that sensation/sensitivity gone.
In context ↗ - Vision problems
I experienced the same. Look for the one with less water content.
In context ↗